<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Demo</title>
    <style>
        div#root {
            font-family: Arial, Helvetica, sans-serif;
            width: 100%;
            height: 100%;
        }
        .banner {
            display: flex;
            height: 100px;
            line-height: 100px;
            padding: 0 10px;
            background: rgba(100, 149, 237, .5);
        }
        .banner div {
            flex: 1;
        }
        h1 {
            color: #ccc;
        }
        ul.list {
            margin: 0;
            padding: 0;
            list-style-type: none;
        }
        ul.list li {
            display: flex;
            height: 50px;
            line-height: 50px;
            background: rgba(204, 204, 204, .5);
            border: 1px solid #fff;
            align-items: center;
            padding: 0 10px;
        }
        .checkbox {
            width: 20px;
            height: 20px;
            cursor: pointer;
        }
        .count {
            display: block;
            margin-left: 20px;
        }
        .meta {
            
        }
    </style>
</head>
<body>
    <div id="root">
        <h1>Demo</h1>
        <div class="banner">
            <div>
                A: <span class="meta" id="A"></span>
            </div>
            <div>
                B: <span class="meta" id="B"></span>
            </div>
            <div>
                C: <span class="meta" id="C"></span>
            </div>
        </div>
    </div>
</body>
<script src="./demo.js"></script>
</html>